In questions determine whether the binary relation is:
(1) reﬂexive, (2) symmetric, (3) antisymmetric, (4) transitive.
-$$\text { The relation } R \text { on the set } \{ ( a , b ) \mid a , b \in \mathcal { Z } \} \text { where } ( a , b ) R ( c , d ) \text { means } a = c \text { or } b = d \text {. }$$

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The Answer of In questions determine whether the binary relation is:
(1) reﬂexive, (2) symmetric, (3) antisymmetric, (4) transitive.
-$$\text { The relation } R \text { on the set } \{ ( a , b ) \mid a , b \in \mathcal { Z } \} \text { where } ( a , b ) R ( c , d ) \text { means } a = c \text { or } b = d \text {. }$$

In Questions Determine Whether the Binary Relation Is: (1) Reﬂexive

In Questions Determine Whether the Binary Relation Is:
(1) Reﬂexive